Toshiba MMU-UP0071YHP-UL Service Manual page 21

No. Item
7 Prevention of cold
air discharge
8 Freeze prevention
control (Low temp.
release)
Outline of specifications
1. In heating operation, the higher temperature of TC2
sensor and TCJ sensor is compared with temperature
of TC1 sensor and then the lower temperature is used
to set the upper limit of the fan tap.
• When B zone has continued for 6 minutes, the
operation shifts to C zone.
• In defrost time, the control point is set to +10.8 ˚F
[+6˚C].
(°F) (°C)
89.6
32
D
86
30
C
82.4
28
78.8
26
68
20
33.8
16
1. In all cooling operation, the air conditioner operates
as described below based upon temp. detected by
TC1, TC2 and TCJ sensors.
• When "J" zone is detected for 5 minutes, the
thermostat is forcedly off.
• In "K" zone, the timer count is interrupted, and held.
• When " I " zone is detected, the timer is cleared
and the operation returns to the normal operation.
• If "J" zone continues, operation of the indoor fan in
LOW mode continues until it reaches the "
It is reset when the following conditions are satisfied.
Reset conditions
1) TC1 53.6°F(12°C) and TC2
53.6°F(12°C)
TCJ
2) 20 minutes passed after stop.
(°F)
(°C)
P1 a
K
Q1
J
2. In all cooling operation, the air conditioner operates
as described below based upon temp. detected by
TC2 and TCJ sensors.
• When "M" zone is detected for 45 minutes, the
thermostat is forcedly off.
• In "N" zone, the timer count is interrupted and held.
• When shifting to "M" zone again, the timer count
restarts and continues.
• If "L " zone is detected, the timer is cleared and the
operation returns to normal operation.
Reset conditions
1) TC1 53.6°F(12°C) and TC2
53.6°F(12°C)
TCJ
2) 20 minutes passed after stop.
(°F)
(°C)
L
P2
N
Q2
M
A zone: OFF
B zone:
Over 78.8°F(26°C), below 82.4°F(28°C), ULTRA LOW (LL)
E
C zone:
Over 82.4°F(28°C), below 86°F(30°C), LOW (L)
D zone:
Over 86°F(30°C), below 89.6°F(32°C), MED (H)
E zone: HIGH (HH)
B
A
I " zone.
53.6°F(12°C) and
TC1 TC2, TCJ
50°F(10°C)(41°F)(5°C) 14°F(-10°C)
P1
6.8°F(-14°C)
32°F(0°C)
Q1
53.6°F(12°C) and
TC2, TCJ
41°F(5°C)
P2
28.4°F(–2.0°C)
Q2
- 21 -
Remarks
TCJ: Temperature of indoor
heat exchanger sensor
• In D and E zones, priority
is given to remote control-
ler fan speed setup.
• In A zone " " is displayed.
TC1: Temperature of indoor
heat exchanger sensor
( ) value:
When the power supply is
turned on, the forced
thermostat becomes OFF if
the temperature is less than
this indicated temperature.